Daya and HowNet duplicate checking system are two completely different duplicate checking softwares, and there are great differences in the range and repetition rate algorithms of detecting databases, which are meaningless and can't be used for reference.

HowNet duplicate checking database is an additional database based on China HowNet retrieval database, books and so on, and also includes the "joint comparison database" of previous graduation thesis. However, in other private institutions' duplicate checking systems, such as Daya, most databases collect free online resources. Moreover, the repetition rate algorithm of HowNet duplicate checking system is more rigorous than that of Daya duplicate checking system.

The criteria for selecting duplicate checking system are consistent with those of schools, which can be used for reference. The school uses the HowNet duplicate checking system, so it uses the HowNet duplicate checking system in advance. For the first draft of graduation thesis, you can use HowNet to check the decomposed version first.

Daya is mainly because there are more books. The database of HowNet includes the full-text database of national doctoral dissertations, the full-text database of national excellent master's dissertations and the joint comparison database of college students' dissertations. Most undergraduate thesis are plagiarized master thesis. If you use Daya, you will find that the documents with the highest repetition rate are unread. If it is to check that part again, it is suggested to use HowNet, which can better find out the plagiarized master's and doctoral thesis.